LATEST weather observations prove what anyone who has been outside in the past two months already knows – this summer has been a washout.

Weather Channel meteorologist Tom Saunders said today that western Sydney had so far experienced its coldest summer on record, with average temperatures at Parramatta down three degrees on normal.

It’s a similar story in Blacktown, where the average temperature of 25C is the lowest since records began there in 1965.

“The city has averaged 24.6C, about one degree below average and depending on maximum temperatures over the next two weeks, these could potentially be the coldest summer days since 1953,” Mr Saunders said.

La Nina weather patterns over the Pacific have been blamed for the cool spell.

“Our country has soaked through two consecutive La Nina years and as a result has recorded its wettest 24 months on record,” Mr Saunders said.

“So far this summer, Sydney has received 303mm of rain – already above the long-term average of 298mm.”

The next two days are expected to be dry and bright, but showers and thunderstorms are predicted to return just in time for the weekend.

“The storms will be similar to last weekend with flash flooding, damaging winds and hail all possible once again,” Mr Saunders said.